Table 2 Histological features of SPN in patients under 20 years of age (n = 29)
| Histological features |
Resection specimens (n = 20) | Incision biopsies (n = 9) | ||
|---|---|---|---|---|
| Number of cases present | Percentage (%) | Number of cases present | Percentage (%) | |
| Pseudopapillary architecture | 20 | 100% | 9 | 100% |
| Solid areas | 20 | 100% | 9 | 100% |
| Eosinophilic cytoplasm | 16 | 80% | 7 | 77.7% |
| Myxoid stroma | 16 | 80% | 7 | 77.7% |
| Hemorrhage | 15 | 75% | 7 | 77.7% |
| Infarction | 14 | 70% | 6 | 66.7% |
| Fibrosis | 14 | 70% | 6 | 66.7% |
| Foamy/ hemosiderin laden macrophages | 12 | 60% | 5 | 55.5% |
| Clear cells | 9 | 45% | 4 | 44.4% |
| Hyaline globules | 6 | 30% | 3 | 33.3% |
| Necrosis | 8 | 40% | 4 | 44.4% |
| Cholesterol clefts | 7 | 35% | 3 | 33.3% |
| Cystic degeneration | 2 | 10% | 1 | 11.1% |
| Microcystic change | 5 | 25% | 2 | 22.2% |
| Nuclear grooves | 5 | 25% | 2 | 22.2% |
| Mitotic activity | 5 | 25% | 3 | 33.3% |
| Atypical cells | 3 | 15% | 2 | 22.2% |
| Giant cells | 4 | 20% | 2 | 22.2% |
| Calcification | 3 | 15% | 1 | 11.1% |